CUET · CHEMISTRY · PYQ PAPER 2025

How much current is needed to pass for 1 sec for depositing a metal with a mass equal to double of its electrochemical equivalent?

A 1 amp
B 2 amp
C 4 amp
D 0.5 amp

Verified Solution

Answer & Solution

Correct Answer

(B) 2 amp

Step-by-step Solution

Detailed explanation

\( m = ZIt \) \( 2Z = Z \times I \times 1 \) \( I = 2 \, \text{A} \)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Match List-I with List-II

List-I (Reagent)	List-II (Characteristic of Compound)
(A) Tollen's Reagent	(I) Aliphatic aldehyde
(B) Iodoform test	(II) Tertiary alcohol
(C) Lucas Reagent	(III) Methyl ketone
(D) Fehling's Reagent	(IV) Aliphatic and aromatic aldehydes

Choose the correct answer from the options given below:

CUET 2025 Hard

Match List-l with List-II

List-l (Complex)	List-II (Property)
(A) Fuel Cell	(I) Anode: \(Zn (s) \rightarrow Zn ^{2+}+2 e^{-}\) Cathode: \(MnO _2+ NH _4^{+}+e^{-} \rightarrow MnO ( OH )+ NH _3\)
(B) A secondary cell	(II) Cathode: \(O _2(g)+2 H _2 O (l)+4 e^{-} \rightarrow 4 OH ^{-}(a q)\) Anode: \(2 H _2(g)+4 OH ^{-}(a q) \rightarrow 4 H _2 O (l)+4 e^{-}\)
(C) Mercury cells	(III) \(Pb (s)+ PbO _2(s)+2 H _2 SO _4(a q) \rightarrow 2 PbSO _4(s)+2 H _2 O (l)\)
(D) Leclanche cell (Simplified)	\((I V) Zn ( Hg )+ HgO (s) \rightarrow ZnO (s)+ Hg (l)\)

Choose the correct answer from the options given below :

CUET 2025 Easy

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LIST – I (Compound name)	LIST – II (Boiling point)
(A) \(CH _3 CH _2 OH\)	(I) 373K
(B) \(CH _3 OCH _3\)	(II) 348K
(C) \(H _2 O\)	(III) 351K
(D) \(CH _3 CH _2 OCH _2 CH _3\)	(IV) 248K

List - I	List - II
(A) RNA	(I) Glycogen
(B) Invert sugar	(II) lactose
(C) Animal starch	(III) Ribose
(D) Milk Sugar	(IV) Sucrose